劍橋詞典a device containing a gas in which units of matter smaller than atoms are shown to be present by the small drops of liquid that they produce 雲室（一種充滿氣躰的設備，在其內部，比原子小的物質粒子經過時，氣躰會凝成液滴，液滴的出現証明這種微粒的存在） 返回 cloud chamber